Heating device



Patented 4ct. 13, 1925.

JOHN K. TOMLINSQN, OIF CHICAGO, ILLINOIS.

HEATING DEVICE.

Application led April 9, 1923. Serial No. 630,737.

To all whom t may concern.' l

Be it known that I, JOHN K. ToMLINsoN,

n a citizen of the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented new and useful Improvements inHeating Devices, of which the following is a full, clear, concise, andexact description, reference being had to the accompanying drawing,forming a part of this specification.

My invention relates to heating devices. In the particular embodimentshown, it is exemplified as an attachment for use with a hot airfurnace, to utilize the heat which is ordinarily wasted, but it isobvious that it is capable of use in other locations and relations.

One of the objects of my invention is to provide a heating device inwhich it is possible to extract practically all of the heat from theproducts of combustion above the temperature of the room to be heated.

A further object of my invention is to provide a heat-utilizing devicewhich will be simple and durable in construction and efficient in use.

A further object of my invention is to pro vide improved means forscraping the soot from the walls of the passages through which theproducts of combustion pass.

A further objectof my invention is to provide improved means for theremoval of the soot.

Further objects will appear from the detailed description to follow andfrom the appended claims.

In the drawings, in which an embodiment of my invention is shown- Figure1 is a somewhat vdiagrammatic part sectional, part elevational view,showing my heating device in connection with a hot air furnace;

, Fig. 2 is a longitudinal vertical section through the heating device,on the line 2-2 r of Fig. 4;

Fig. 3 is a longitudinal vertical sectional view through the heatingdevice on theline 3-3 of Fig. 4; and

Fig. 1 is a vertical transverse sectional view substantially on the line1 -4 of Fig. 2.

Referring now to the drawings in detail, the construction shown thereincomprises a heating device 10, having a plurality of elongated spacedparallel passages 11 for the products of combustion, and a plurality ofelongated parallel passages 12 for the air to be heated, filling thespace betweenthe first mentioned passages. The products of combustionpass in one direction through the first set of passages, andthe airpasses in the opposite direction through the second set of passages,thus providing for the greatest possible transfer of heat from theproducts of combustion to the air to be heated. l

As shown in Fig. 1 the device may be in-y terposed in the iue of anordinary hot air furnace, the passages for the products of combustionbeing, as it were, in series with the Hue, sectionsl and 1,4, so thatthe flue gases passthrough these spaced parallel passages, the hot fluegases thus heating the air which is. going in the opposite directionbetween the passages for the flue gases. The air thus heated may betaken in at that part of the device adjacent'the point where i `beheated through the device in the other direction. n

l The air, after passing through the heating passages in the device,leaves the device through the pipe 18, which may, as indicated in. thedrawing, lead to the heating chamber 19' surrounding the :fire pot 20 ofthe furnace, from whence it goesthrough the. pipes 21 to the rooms to beheated. If desired, the pipe 18 might lead direct to, the yroom or roomstoA be heated.

In order to provide for the ready transfer of heat from the flue gasesto the air to be heated, it isdesirable that the walls separating theflue gases from the air to be heated should be of thin heat conductingmaterial, such as sheet metal, and should be kept free from soot. Forthis purpose, Scrapers 22 are provided, mounted to swing up and down inthe high narrow passages points as indicated at 16 11 for the fluegases, the edges of these scrapers engaging the side walls of thesepassages to keep them clean.

In order to catch the soot scraped from the walls of the flue gaspassages, a removable pan 23 is provided, located under; neath the fluegas passages. In order to provide for the removal of this receptacle, adoor 24 is provided at the farther end of the device, which can beopened to enable the pan 23 to be drawn out.

This pan construction-is shown in Fig. 3. As an alternativeconstruction, in place of drawing the pan out of the end, the pan mightbe constructed as asort of valve or damper', c-operating with the lowerwall 25 of the flue gas passage, the lower wall 25 and the bottom 26 ofthe pan being provided with a plurality of openings 27 and 28, which canbe brought into registration by movement of the slidable member, topermit the soot, etc., to fall down and o'ut. As shown in Fig. 4, thewalls of the passages for the flue gases and air to be heated, may beformed of sheetmetal, pressed` or otherwise formed into shape. showncomprises in the main an outside trough member 29, having sides 30r and3l and a bottom 32, a top member 33 extending from side to side of thetrough-shaped member, and a partitionv member 34 having a plurality ofdeep channels, which form passages for the air to be heated, the spacesbetween these deep channels forming passages for the flue gas.

The partition member 34 does not eX- tend the full length of the trough'member 29, a space being left at each end,- the space at one end Aproviding for the con*- nection with the flue section 13, and the spaceat the other end providing for a connection with the nue section 14. Theends of the channel portions of the partition member 34 are closed bymeans ofsheet metal heads 35, 36, (Fig. V2), which prevent the air to beheated from mixing with the flue gas.y .The top member 33 is aperturedat 37 and 38 to provide for the connection with the air inlet pipe l5,and the air outlet4 pipe 18. The path of the flue gas and of the air tobe heated,is indicated by the arrows A and B respectively in Figs. l, 2and 3.

As shown in Fig. 2 the fans 39 and 4U which force the gas and air thrutheir respective passagesV may both be mounted on the same shaft 41,which may be rotatably mounted in brackets 42, 43 and 44, and driven inany Vsuitable manner by a `drive pulley 45.

As shown in Figs. 3 and 4, the Scrapers y22 may be mounted on cross pins46 which in turn are mounted on rock arms 47, 'pivoted at 48'. Theserock arms may lac tuz'ited by means of a crank member 49, (Fig. 4),

This construction i secured to the shaft 50, to which the rock arm 47 issecured.

In order to cause practically all of the flue gas to pass directly incontact Vwith the partition member, to cause the greatest possibletransfer of heat, barrier plates 5l may vbe provided in the trough orpan 23, to pre- -vent any great amount of flow of the flue glasunderneath the partition member 34.

Vhile I have shown but one form of my invention, it is obvious that itmay be embodied in other forms covered and defined by the appendedclaims.

Having thus described my invention, what I claim as new and desire tosecure by United States Letters Patent, is'.

1. A heating device comprising a straight tube rectangular in crosssection having an opening for the Afurnace connection at one end of itslower side and having an opening for the flue connection at the otherend, a straight partition member in said tube and extendingAlongitudinally thereof and having deep channels therein spaced fromeach other, each channel being closed at both ends, the spaces betweenthe channels providing passages for the products of combustion, saidtube having an opening in its top side adjacent one end of the partitionmember for admitting air to be heated 'to one end of said channels, saidtube also having an opening in its top adjacent the other end of thepartition member for the escape of the heated air from said channels,said tube rcomprising a sheet metal channel member of uniform crosssection and a sheet metal cover, and said partition member comprising asheet metal member d eepl57 corrugated in cross section to form the deepchannels.

y2. A heating device lia-ving passages for the flow in one direction ofthe products of combustion and passages for the flow in the oppositedirection of the air to be heated, comprising a straight elongated tube,a partition member between Ythe hot gases and the air to be heated, saidpartition comprising aplurality `of fiat vertical walls, longitudinalscraper members for scraping said walls, and means for mounting saidScrapers for parallel movement comprising a pair of rock memberspivotally mounted adjacent the ends of said partition respectively andpivotally connected with the respective ends of said scraper members. y

3. A heating device having passages for the flow in one direction of theproducts of conrbusti'on andpassages for the flow in the oppositedirection of the air to be heated, comprising a straight elongated tube,a partition member between the hot gases and the air to be heated, saidpartition comprising a plurality of 'flat vertical walls, longitudinalscraper members for scraping 'said walls, andmeahs for mounting saidScrapers for parallel movement comprising a pair of rock memberspivotally mounted adjacent the ends of said partition respectively andpivotally connected with the respeotive ends of said scraper members,said tube being extended beyond said partition at each end to provide apair of chambers which receive said rock members, one of said chambershaving a port for the inlet of the hot gases and the other of said 10chambers having a port for the escape of said gases.

In Witness whereof, I have hereunto subscribed my name.

JOHN K. TOMLINSON.

